Abdul-Rahman bin Awf went down into the grave of the Prophet ﷺ. The narrator said, "It is as if I can still see them, four of them."
حدثنا محمد بن الصباح أخبرنا سفيان عن ابن أبي خالد عن الشعبي
أن عبد الرحمن بن عوف نزل في قبر النبي ﷺ قال كأني أنظر إليهم أربعة
No references are available.
[Its isnad is daif] Bayhaqi narrated it (4/53) from the hadith of Abu Dawud through this route. Sufyan Thawri used "an" (indicating uncertain direct transmission). The hadith has daif corroborating narrations.